SmogRank / World / Slovenia / September 2025

Most polluted cities in Slovenia, September 2025

8 cities in Slovenia ranked by their average PM2.5 over the 30 days. Worst: Maribor at 6.6 µg/m³, #1,637 of 2,711 cities in the world. Cleanest: Koper at 5.3. A city needs measurements on 70% of the days to be ranked.

← Maribor 6.6 µg/m³ 20 µg/m³0
Every city in Slovenia ranked for September 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1MariborUrban Municipality of Maribor
    1
  2. 2PtujUrban Municipality of Ptuj
    1
  3. 3LjubljanaLjubljana
    1
  4. 3CeljeUrban Municipality of Celje
    1
  5. 5Novo MestoUrban Municipality of Novo Mesto
    1
  6. 6KranjUrban Municipality of Kranj
    1
  7. 7TrbovljeMunicipality of Trbovlje
    1
  8. 8KoperUrban Municipality of Koper
    1
Low1–3
Moderate4–6
High7–9
Very high10

The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, September 2025 · Slovenia now

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SmogRank, most polluted cities in Slovenia, PM2.5, September 2025, smogrank.com/si/history/2025-09 (accessed 2 Oct 2026).

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